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Quote:
Originally Posted by lightbringer View Post

How can i determine my card's ASIC and what influences does it have in terms of overclocking? This thread's the first place where i meet the term.
In short terms a higher ASIC means a more efficient energy usage if I'm correct.
Lower ASIC cards have more voltage leakage, thus need higher voltage.

Also if the card has a high ASIC quality(70% and up) it is better for air/stock cooling.
Low ASIC quality cards scream: put me under water/ln2. If cooled properly these cards will clock higher. Also low ASIC quality cards can cope with more voltage, again with good cooling.

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Ah i see, thanks!
And how do you determine the percent? I see 70% ASIC, etc.

Mine is set to 1.312V VDDC in bios, and its 1.295-1.275 under load, in GPU-z. Is that good or bad drop?
 
Quote:
Originally Posted by lightbringer View Post

Ah i see, thanks!
And how do you determine the percent? I see 70% ASIC, etc.

Mine is set to 1.312V VDDC in bios, and its 1.295-1.275 under load, in GPU-z. Is that good or bad drop?
Are you running it under water?
I highly recommend you not to give it that much voltage with stock cooling.

Open gpu-z and rightclick on the top bar. There you can choose to display the ASIC.

Your vdroop looks normal to me. My card set at 1.162v drops to about 1.148.

I use that voltage to game on 1100 core 1500 mem btw. So 1.275 is a bit too much if u ask me.
 
Ye, over 1.3 is too high, i just used that at the first tests at 1200 GPU, to see what's the clock limit.

Normally it runs around 1.2V in the 1100-1150 range
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Since i found this topic a couple of days ago, im continously testing, to find the sweet spot.
As it turned out, the ram wont go over 1450, even 1475 produces glitches, errors, even grey striped screens.
The GPU's limit is around 1190 stable, even on 1.3V. :sadface:

The card's like this:



So the coolers blow air to the whole PCB, thats why im not worried about the voltage regulators temp.
I've also modded the fan profiles in bios, so it maxes on 65C load during Unigine heaven with maxed out settings tesselation etc, in closed case.

Thank you very much for the info about ASIC quality!
It turned out to be 66.1 on this one, i think this explains the relatively low clocks even on high voltage on air.

The sweet spot seems to be 1150 gpu / 1450 ram, at 1.22V VDDC. The max voltage value according to gpuz, under Heaven load, is 1.195V, and averages in the 1.18V region.
Is this okay, if i leave it like this? Temps are 60-65C max, on very heavy load.

Need to finalize this card's clocks today, because my 4670 arrives tomorrow and thats a new story
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Quote:
Originally Posted by lightbringer View Post

Ye, over 1.3 is too high, i just used that at the first tests at 1200 GPU, to see what's the clock limit.

Normally it runs around 1.2V in the 1100-1150 range
smile.gif
Since i found this topic a couple of days ago, im continously testing, to find the sweet spot.
As it turned out, the ram wont go over 1450, even 1475 produces glitches, errors, even grey striped screens.
The GPU's limit is around 1190 stable, even on 1.3V. :sadface:

The card's like this:



So the coolers blow air to the whole PCB, thats why im not worried about the voltage regulators temp.
I've also modded the fan profiles in bios, so it maxes on 65C load during Unigine heaven with maxed out settings tesselation etc, in closed case.

Thank you very much for the info about ASIC quality!
It turned out to be 66.1 on this one, i think this explains the relatively low clocks even on high voltage on air.

The sweet spot seems to be 1150 gpu / 1450 ram, at 1.22V VDDC. The max voltage value according to gpuz, under Heaven load, is 1.195V, and averages in the 1.18V region.
Is this okay, if i leave it like this? Temps are 60-65C max, on very heavy load.

Need to finalize this card's clocks today, because my 4670 arrives tomorrow and thats a new story
medieval.gif
No doubt if you cool that card better it will clock higher.

That is a 7950 right? I don't have more info from you.

To compare things:
My 7950 vapor-x(68.8% ASIC) uses 1.15v for 1100 core and mem will clock to about 1650-1700 with stock voltage(1.5v) and will clock as high as 1800-1850 with 1.62v. Core will clock at 1200 with around 1.19v.

But 1100 core 1500 mem is plenty for me for daily use. Also keeps it pretty silent(auto fan speed around 52%).
 
Quote:
Originally Posted by lightbringer View Post

Ehm mine's a 7950 right
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How can you adjust vram voltage? VBE only shows VDDC..
You can use the modded version of Sapphire Trixx to adjust the memory voltage.
But I don't advice to do that for daily use.

Also you must know which brand memory chips your card has.
Mine has Hynix which can take 1.6-1.65v. But again it is better to have good cooling for them(water) when you increase the voltage.

I just used increased mem voltage to run benchmarks.

I took some time for you to show you the difference in memory clocks versus gpu clocks with a couple of 3d mark 11 runs.
All tests were done with a 4.2ghz overclock on my fx-8320 cpu.
As you can see increasing the memory clock only gives a small performance increase compared to gpu overclocking.

You can click on the links to read the full details of the tests.

1000 core 1250 mem: 9600 gpu score.
http://www.3dmark.com/3dm11/7473094

1000 core 1600 mem: 9697 gpu score.
http://www.3dmark.com/3dm11/7473133

1200 core 1250 mem: 11227 gpu score.
http://www.3dmark.com/3dm11/7473189

1200 core 1800 mem: 11500 gpu score.
http://www.3dmark.com/3dm11/7473222

Hope this helps to clear things up a bit.

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I have a sapphire 7950 boost that while I don't mind the current oc can easily see more potential with a modified bios.

Asic Quality is 70.6
Device ID 1002-679A

Sapphire Boost 7950.zip 40k .zip file


Would like a higher power limit and more voltage so I can make 1150 or 1200mhz core stable.

Only other thing to note I have moderate vdroop when in game compared to desktop.
 

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News: i just found out that 1.3V VDDC drops to the 1.22-1.23V! range under heavy load, like Unigine Valley. Max value according to GPUZ is around 1.285V but the VDDC graph is mostly showing 1.22V..
Thats what you call a drop
doh.gif
Ill try 1.32V and see what drops i get..

( And i wondered why cant i reach 1200 on this one.. Well with 1.22v good luck
biggrin.gif
)
 
Quote:
Originally Posted by lightbringer View Post

News: i just found out that 1.3V VDDC drops to the 1.22-1.23V! range under heavy load, like Unigine Valley. Max value according to GPUZ is around 1.285V but the VDDC graph is mostly showing 1.22V..
Thats what you call a drop
doh.gif
Ill try 1.32V and see what drops i get..

( And i wondered why cant i reach 1200 on this one.. Well with 1.22v good luck
biggrin.gif
)
Haha quality card.
I have my card running 1100 core all-day at 1.156v and it drops to around 1.148v.
1.22v will make it run 1200 no problem.
 
With kahboom's help, i managed to make it run on 1200 with 1.25V VDDC set, which is 1.21-1.23V according to GPU-Z.
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(needed to touch TDP as well, in the bios editor)
 
Quote:
Originally Posted by lightbringer View Post

With kahboom's help, i managed to make it run on 1200 with 1.25V VDDC set, which is 1.21-1.23V according to GPU-Z.
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(needed to touch TDP as well, in the bios editor)
I would download Sapphire Trixx 4.4 mod if you haven't already:

TRIXX.zip 3450k .zip file


I also use it for benching because it lets me raise my memory voltage to 1.65v for 1800-1850 mem clock.

This way you can change the voltage and test things out before baking it into the bios.

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Will check, tyvm
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According to GPUZ, running at 1200MHz and 1.3V VDDCset in bios, the gpu runs on 1.25-1.26V with 1 spike of 1.28, temperatures are under load are 70C max at GPU and 80C for VRM's.
Maybe found a good setting.. The temps are okay, right?
 
Quote:
Originally Posted by lightbringer View Post

Will check, tyvm
smile.gif


According to GPUZ, running at 1200MHz and 1.3V VDDCset in bios, the gpu runs on 1.25-1.26V with 1 spike of 1.28, temperatures are under load are 70C max at GPU and 80C for VRM's.
Maybe found a good setting.. The temps are okay, right?
Under which load that is?
Benching/stressing or under normal gaming?

Personally I wouldn't advice you to run 80c on the vrm's for daily use. Card will wear out pretty quick with that temp.
The core temp is okay, not great but okay.
 
Aye these were measured under stressing. (i guess maxed out Unigine Heaven can be called stress:) )
Under normal gaming it is cooler. (and even "normal gaming" is Skyrim, maxed out)

The bios seems to be almost complete, just made some changes to fan profiles.. Now GPU stays around 65 and VRM's are at 70 under stressing.

Sadly this piece has terrible Vdrop, at 1.3V set, the actual VDDC can be anywhere from 1.21 to 1.28V, but its stable and well under 70C.


Just for curiosity, i tried it with the factory bios with the same load, and temperature the values were exactly the same.


Thank you all for your help! I wanted to change this since i got my card
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biggrin.gif
 
Quote:
Originally Posted by lightbringer View Post

Aye these were measured under stressing. (i guess maxed out Unigine Heaven can be called stress:) )
Under normal gaming it is cooler. (and even "normal gaming" is Skyrim, maxed out)

The bios seems to be almost complete, just made some changes to fan profiles.. Now GPU stays around 65 and VRM's are at 70 under stressing.

Sadly this piece has terrible Vdrop, at 1.3V set, the actual VDDC can be anywhere from 1.21 to 1.28V, but its stable and well under 70C.


Just for curiosity, i tried it with the factory bios with the same load, and temperature the values were exactly the same.


Thank you all for your help! I wanted to change this since i got my card
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biggrin.gif
You made sure you upped the power limit?
If that is too low voltage can also fluctuate.
 
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